4 across
Criticise
character
from
Athens,
thus
creating
sort
of
poetry
(3,5)
Criticise character from Athens, thus creating sort of poetry (3,5)
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The definition is at the end of the clue.
How the clue works
Right, so sort of poetry at the end is your definition - rap's basically a spoken poetic form. Then it's built in three bits: RAP means "criticise", MU is your "character from Athens" (a Greek letter, since Athens is in Greece), and SIC is Latin for "thus" - stick RAP, MU and SIC together and you've got your answer.